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explain hell heroults process . why cryolite is not directly electrolysed to get aluminium

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Q. The Hall-Heroult process is used industrially to prepare aluminium by the electrolysis of cryolite (or Na

_{3}

_{6}

).
If true enter 1, else enter 0.

N a_{3} A l F_{6}

A l_{2} O_{3}

in Hall-Heroult process to ____ m.p. and to ___________ electrical conductivity.

Q. Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out _______________.

Q. The function of adding cryolite in the electrolyte reduction of alumina by Hall-Heroult process is to :

Q. In the extraction of aluminium by electrolytic process, cryolite is added to ________.

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